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From: Andrew Morton <akpm@linux-foundation.org>
To: Daniel Jordan <daniel.m.jordan@oracle.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	aaron.lu@intel.com, dave.hansen@linux.intel.com,
	mgorman@techsingularity.net, mhocko@kernel.org,
	mike.kravetz@oracle.com, pasha.tatashin@oracle.com,
	steven.sistare@oracle.com, tim.c.chen@intel.com
Subject: Re: [RFC PATCH v3 0/7] ktask: multithread CPU-intensive kernel work
Date: Tue, 5 Dec 2017 14:23:00 -0800
Message-ID: <20171205142300.67489b1a90605e1089c5aaa9@linux-foundation.org> (raw)
In-Reply-To: <20171205195220.28208-1-daniel.m.jordan@oracle.com>

On Tue,  5 Dec 2017 14:52:13 -0500 Daniel Jordan <daniel.m.jordan@oracle.com> wrote:

> This patchset is based on 4.15-rc2 plus one mmots fix[*] and contains three
> ktask users:
>  - deferred struct page initialization at boot time
>  - clearing gigantic pages
>  - fallocate for HugeTLB pages

Performance improvements are nice.  How much overall impact is there in
real-world worklaods?

> Work in progress:
>  - Parallelizing page freeing in the exit/munmap paths

Also sounds interesting.  Have you identified any other parallelizable
operations?  vfs object teardown at umount time may be one...

>  - CPU hotplug support

Of what?  The ktask infrastructure itself?

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Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-12-05 19:52 Daniel Jordan
2017-12-05 19:52 ` [RFC PATCH v3 1/7] ktask: add documentation Daniel Jordan
2017-12-05 20:59   ` Daniel Jordan
2017-12-06 14:35   ` Michal Hocko
2017-12-06 20:32     ` Daniel Jordan
2017-12-08 12:43       ` Michal Hocko
2017-12-08 13:46         ` Daniel Jordan
2017-12-05 19:52 ` [RFC PATCH v3 2/7] ktask: multithread CPU-intensive kernel work Daniel Jordan
2017-12-05 22:21   ` Andrew Morton
2017-12-06 14:21     ` Daniel Jordan
2017-12-05 19:52 ` [RFC PATCH v3 3/7] ktask: add /proc/sys/debug/ktask_max_threads Daniel Jordan
2017-12-05 19:52 ` [RFC PATCH v3 4/7] mm: enlarge type of offset argument in mem_map_offset and mem_map_next Daniel Jordan
2017-12-05 19:52 ` [RFC PATCH v3 5/7] mm: parallelize clear_gigantic_page Daniel Jordan
2017-12-05 19:52 ` [RFC PATCH v3 6/7] hugetlbfs: parallelize hugetlbfs_fallocate with ktask Daniel Jordan
2017-12-05 19:52 ` [RFC PATCH v3 7/7] mm: parallelize deferred struct page initialization within each node Daniel Jordan
2017-12-05 22:23 ` Andrew Morton [this message]
2017-12-06 14:21   ` [RFC PATCH v3 0/7] ktask: multithread CPU-intensive kernel work Daniel Jordan

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